update fa translation
update fa translation

Change-Id: Ic364bdc7b34ac3d35a5ce812e1db94abbd68f40d
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/214818
Tested-by: Jenkins

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms